Welcome.

You will begin to get very stressed with this process. Just remember, if you overcome these obstacles, its a fruitful endeavor. Also, no one is ROI positive throughout their entire FBA journey.

International shipments typically only have one tracking number.

Your shipment will be placed on a cargo ship (more than likely you ordered ocean freight). This carries no tracking number. Once your items reach the United States, a local carrier will pick your shipment up (this where the tracking number you were provided comes in).

Your shipments will be taken to the destination FBA center. You can input that tracking number online at whatever carrier website. (Im guessing its a UPS tracking number so...go to UPS.com to track your shipment).

Once you put in that one tracking number, you should see more details about your shipment such as the 75 boxes (cases). The website should tell you the tracking number for each individual box...even though its all going to be the same as the one tracking number you were provided.

If you are referring to uploading that tracking number to Seller Central, just copy and paste that one tracking number for all of your boxes on Seller Central.

I have never had a problem with this method...even though Amazon wants you to put in each unique tracking number.